Heat shrink is the lifeline of an engineer dealing with electronics and electrical circuits. This heat shrink comes in four different colors - red, blue, yellow, and the traditional black.
Heat shrink keeps your stuff all safe and kept together. Especially when wiring and soldering, use heat shrink to add mechanical strength to cables. The colors can be used to color-code different wires so you know which wire is power, data, ground, analog in, etc
The package will contain a single meter of heat shrink of whichever color and size you choose from the options.